Heh. Well, those power thingies & floppy drives are some of the most common things to fall over, but nah it's not
likely with a new computer. Thing is, it might have always been very slightly defective...or it could be one of those unlikely cases.
Here's how I see it (course, I'm making up these numbers from the top of my head)...
- IRQ conflict ...40% chance
- Power supply problem ...25% (would be higher if your machine was old)
- Damaged or faulty software ...15% (lower if you were running no programs & doing nothing when it rebooted)
- Short power dips, after which the PC preceeds to reboot ...maybe 10%
- Hoodoo ...10%
They're all real possibilities though, so take your pick
One more...
- Faulty memory ...I'm not sure if this can cause the symtoms you described (and it would nevertheless be very unlikely since RAM is durable stuff), but I'll throw it out there anyway
The worst part is, if you do bring it in to a tech shop, unless they're able to duplicate the problem they might have to go with guesswork.